This article is cited in 10 papers

Dielectrics

Paramagnetic defects in gamma-irradiated Na/K-silicate glasses

A. F. Zatsepin, V. B. Guseva, V. A. Vazhenin, M. Yu. Artemov

Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg

Abstract: Gamma-irradiated alkali silicate glasses of the variable composition 22$x$Na$_2$O $\cdot$ 22$(1-x)$K$_2$O $\cdot$ 3CaO $\cdot$ 75SiO$_2$ have been studied using the electron paramagnetic resonance (EPR) method. It has been established that, upon the successive replacement Na $\to$ K in the two-alkali silicate glass, the EPR spectrum of hole centers on nonbridging oxygen atoms can be represented as a superposition of signals from the oxygen centers $HC_1$ (Na), $HC_2$ (Na), $HC_1$ (K), and $HC_2$ (K), which are characteristic of single-alkali silicate systems. The concentration dependences of hole and electron paramagnetic centers do not exhibit specific features that can be interpreted as a manifestation of the “mixed-alkali effect”. The results obtained have been discussed taking into account the extended model of centers on nonbridging oxygen atoms.

Received: 29.02.2012

 English version: Physics of the Solid State, 2012, 54:9, 1776–1784

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